Source : Webster's Revised Unabridged Dictionary (1913)

Serge \Serge\, n. [F. serge, sarge, originally, a silken stuff,
   fr. L. serica, f. or neut. pl. of sericus silken. See
   {Sericeous}, {Silk}.]
   A woolen twilled stuff, much used as material for clothing
   for both sexes.

   {Silk serge}, a twilled silk fabric used mostly by tailors
      for lining parts of gentlemen's coats.